Though I've mentioned it before, again I have to recommend MP3 Book Helper . It's just my opinion, but I like it better than Tag & Rename. I'm not sure if you can do the multiple Genre thing, but I could give it a try. Either way, the people developing BP3BH do updates to the software, and consider user requests very seriously. Oh, and it's free. Can't beat it for regular expression support, either.
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Dave